Question

2. NH4Cl(s) ­­> NH3 (g) + HCl(g) Delta H = +42.1 kilocalories Suppose the substances in...

2. NH4Cl(s) ­­> NH3 (g) + HCl(g) Delta H = +42.1 kilocalories Suppose the substances in the reaction above are at equilibrium at 600K in volume V and at pressure P. State whether the partial pressure of NH3 (g) will have increased, decreased, or remained the same when equilibrium is reestablished after each of the following disturbances of the original system. Some solid NH4Cl remains in the flask at all times. Justify each answer with a one­or­two sentence explanation.

(a) A small quantity of NH4Cl is added.

(b) The temperature of the system is increased.

(c) The volume of the system is increased. (d) A quantity of gaseous HCl is added. (e) A quantity of gaseous NH3 is added.

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Answer #1

Solution:

A) A small quantity of NH4Cl is added,the rate of farward reaction is increases and quantity of NH3 gas increases,hence partial pressure of NH3 increases.

B) The temperature of the system is increased the rate of reaction is increases and quantity of NH3 gas increases,hence partial pressure of NH3 increases.

C) The volume of the system is increased,partial pressure of NH3 decreases,(P=F/A)

D) A quantity of gaseous HCl is added,backward reaction takes place and quantity of NH3 decreases.hence partial pressure is decreases.

E) A quantity of gaseous NH3 is added.,partial pressure of NH3 is increases.

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